66 lines
2.0 KiB
JavaScript
66 lines
2.0 KiB
JavaScript
goog.provide('ol.geom.flat.transform');
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goog.require('goog.vec.Mat4');
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/**
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* @param {Array.<number>} flatCoordinates Flat coordinates.
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* @param {number} offset Offset.
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* @param {number} end End.
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* @param {number} stride Stride.
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* @param {goog.vec.Mat4.Number} transform Transform.
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* @param {Array.<number>=} opt_dest Destination.
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* @return {Array.<number>} Transformed coordinates.
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*/
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ol.geom.flat.transform.transform2D =
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function(flatCoordinates, offset, end, stride, transform, opt_dest) {
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var m00 = goog.vec.Mat4.getElement(transform, 0, 0);
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var m10 = goog.vec.Mat4.getElement(transform, 1, 0);
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var m01 = goog.vec.Mat4.getElement(transform, 0, 1);
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var m11 = goog.vec.Mat4.getElement(transform, 1, 1);
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var m03 = goog.vec.Mat4.getElement(transform, 0, 3);
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var m13 = goog.vec.Mat4.getElement(transform, 1, 3);
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var dest = opt_dest ? opt_dest : [];
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var i = 0;
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var j;
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for (j = offset; j < end; j += stride) {
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var x = flatCoordinates[j];
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var y = flatCoordinates[j + 1];
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dest[i++] = m00 * x + m01 * y + m03;
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dest[i++] = m10 * x + m11 * y + m13;
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}
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if (opt_dest && dest.length != i) {
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dest.length = i;
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}
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return dest;
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};
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/**
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* @param {Array.<number>} flatCoordinates Flat coordinates.
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* @param {number} offset Offset.
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* @param {number} end End.
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* @param {number} stride Stride.
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* @param {number} deltaX Delta X.
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* @param {number} deltaY Delta Y.
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* @param {Array.<number>=} opt_dest Destination.
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* @return {Array.<number>} Transformed coordinates.
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*/
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ol.geom.flat.transform.translate =
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function(flatCoordinates, offset, end, stride, deltaX, deltaY, opt_dest) {
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var dest = opt_dest ? opt_dest : [];
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var i = 0;
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var j, k;
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for (j = offset; j < end; j += stride) {
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dest[i++] = flatCoordinates[j] + deltaX;
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dest[i++] = flatCoordinates[j + 1] + deltaY;
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for (k = j + 2; k < j + stride; ++k) {
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dest[i++] = flatCoordinates[k];
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}
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}
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if (opt_dest && dest.length != i) {
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dest.length = i;
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}
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return dest;
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};
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